Development and application of streakline visualization in hypervelocity flows
摘要:
A method for visualizing streaklines in hypervelocity flows has been developed. The method uses the high temperatures produced in hypervelocity flows to ablate small amounts of sodium deposited onto a wire stretched across the flow and to broaden the lines in the sodium spectrum. By using a dye laser, tuned to a wavelength close to one of the sodium D-lines, as the light source in shadowgraph or Schlieren visualization, streaklines seeded with sodium become visible through absorption and/or enhanced refractivity. The technique has been used to investigate the stability of the shear layer produced by the curved bow shock on a cylindrically blunted wedge. The results suggest that the shear layer is unstable, exhibiting structures with a wavelength that is comparable to half the nose radius of the body.
The Mechanism of a Diels-Alder Reaction. I. A Retrodiene Decarboxylation<sup>1</sup>
作者:M. J. Goldstein、G. L. Thayer
DOI:10.1021/ja01087a016
日期:1965.5
Abati; Contaldi, Gazzetta Chimica Italiana, 1906, vol. 36 II, p. 838,841
作者:Abati、Contaldi
DOI:——
日期:——
US4009278A
申请人:——
公开号:US4009278A
公开(公告)日:1977-02-22
Development and application of streakline visualization in hypervelocity flows
作者:P. Lemieux、H. Hornung
DOI:10.1007/s00348-002-0433-8
日期:2002.7
A method for visualizing streaklines in hypervelocity flows has been developed. The method uses the high temperatures produced in hypervelocity flows to ablate small amounts of sodium deposited onto a wire stretched across the flow and to broaden the lines in the sodium spectrum. By using a dye laser, tuned to a wavelength close to one of the sodium D-lines, as the light source in shadowgraph or Schlieren visualization, streaklines seeded with sodium become visible through absorption and/or enhanced refractivity. The technique has been used to investigate the stability of the shear layer produced by the curved bow shock on a cylindrically blunted wedge. The results suggest that the shear layer is unstable, exhibiting structures with a wavelength that is comparable to half the nose radius of the body.
Abati, Gazzetta Chimica Italiana, 1908, vol. 38 I, p. 153